diff --git a/pdf-app/pom.xml b/pdf-app/pom.xml
index 9c47b0a..2f05470 100644
--- a/pdf-app/pom.xml
+++ b/pdf-app/pom.xml
@@ -177,7 +177,7 @@
 		<dependency>
 			<groupId>org.apache.logging.log4j</groupId>
 			<artifactId>log4j-core</artifactId>
-			<version>2.5</version>
+			<version>2.17.1</version>
 		</dependency>
 		<dependency>
 			<groupId>org.slf4j</groupId>